Gas in the soil of paddy field

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Abstract
We have deviced the method to collect and analyze the free gas which is present in the soil of a paddy field. A metallic tube, consisted of three parts, A, B and C as shown in Fig. 1-(1), is pushed into the paddy soil and one or two days later the tube containing the soil is taken out of the surrouding soil by hands. Keeping under the acidified water, both sides of the tube A and C, are cut off and the soil contained in the B-tube is loosened so as to liberate the gas in the soil as air bubbles in the water.Then the air bubbles are caught by the funnel (C) of the gas-collector Fig. 1-(2). Before use, the apparatus is filled with acidified glycerin solution (glycerin 2 parts+water 1 part). Sample gas collected in the funnel is then driven up to the top of the test-tube (D), by opening the cock (B) between D and C and sucking up the content of the funnel with an injector-tube (F). After the cock is closed between D and C, the sample gas is driven into the 2cc. messpippete (E) and the volume of the gas is read. Finally the sample gas is driven over into the injector-tube.Then the injector-tube is removed from the rubber tube (G) and under acidified glycerin solution the gas is transferred into the gas-analyzer. Krogh's micro-gas-analyzer is modified (Fig. 1-(3)). With 20%-NaOH solution, carbon-dioxide in the sample gas is absorbed, and with 20%-pyrogallol, oxygen is removed. As when the temperrture changes are guarded against, the loss in volume represents carbon dioxide and oxygen, we can determine the percentage of carbon-dioxide and oxygen of the sample gas.

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